full bridge needs basically double the transistors but its pretty easy to tell full bridge from half. one needs filters on the output section one doesn't i know when i designed a circuit for power distribution i use a transformer that can handle ruffly 200% of the continuous load.. depending on what im designing it for.
for example if i'm using it in a lighting circuit not point becasue the lights have ballast transformers and start capacitors to keep power-factor/ripple down. on the other had lets say a machine shop where they aren't using soft starts. you can run into power factor and ripple problems.. while its true that lates and mills ARE VFDs still you can have several machines operating at once and starting another and loading it down can cause sag..
SO that being said any amp i will design/have built you better believe that the transformers will be-able with withstanding much more current that rated for continuous duty cycle..